/* roulang page: index */
:root {
      --primary: #0A4C7B;
      --accent: #F15A24;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --border: #E2E8F0;
      --text-primary: #1E293B;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --footer-bg: #062D4A;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --max-width: 1200px;
      --header-height: 70px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    
    button, .btn {
      border: none;
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      transition: var(--transition);
      background: transparent;
      letter-spacing: 0.3px;
    }
    
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: #FFFFFF;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(241,90,36,0.3);
    }
    .btn-primary:hover {
      background: #D84315;
      box-shadow: 0 6px 14px rgba(241,90,36,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }
    
    /* 英雄区 */
    .hero {
      background: linear-gradient(105deg, rgba(10,76,123,0.08) 0%, rgba(248,250,252,0.7) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding: 4rem 0 5rem;
      position: relative;
      border-bottom: 1px solid var(--border);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 2;
      min-width: 300px;
    }
    .hero h1 {
      font-size: 2.8rem;
      color: var(--primary);
      line-height: 1.2;
      font-weight: 700;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }
    .hero-stats {
      flex: 1.4;
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(10px);
      padding: 1.8rem;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(226,232,240,0.8);
    }
    .stat-card {
      flex: 1 1 100px;
      text-align: center;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      display: block;
    }
    .stat-label {
      color: #475569;
      font-size: 0.9rem;
    }
    
    /* 通用区块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      text-align: center;
      margin-bottom: 0.5rem;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    
    /* 服务矩阵 2x3 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card.wide {
      grid-column: span 1; 
    }
    /* 使第一行两个卡片更宽 (占2列中的1.5感觉, 用自定义处理) 改为第一行两个占据前半部分? 我们采用:第一行放两个wide卡片，但这会打破3列。设计规范要求2x3非对称布局: 用grid-template-areas调整，显式grid放置。简单操作: 用CSS选择器把第一、第二个变为独立行宽。我们将前两项设在两级app：重新排列grid来表现非对称✅手脚在标记上用类干活 */
    .services-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
    }
    .service-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      flex: 1 1 calc(33.333% - 24px);
      min-width: 260px;
    }
    .service-item.priority {
      flex: 2 1 calc(66.666% - 24px);
      background: #fff;
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 0.8rem;
    }
    .priority .service-icon {
      font-size: 2.8rem;
    }
    .service-item h3 {
      color: var(--text-primary);
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    .link-arrow {
      color: var(--accent);
      font-weight: 600;
      margin-top: 1rem;
      display: inline-block;
    }
    .service-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 数据对比 */
    .compare-row {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
    }
    .bar-group {
      margin-bottom: 1.5rem;
    }
    .bar-label {
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.2rem;
    }
    .progress {
      height: 10px;
      background: #ECEFF3;
      border-radius: 10px;
      overflow: hidden;
      display: flex;
    }
    .progress-fill {
      background: var(--primary);
    }
    .fill-accent {
      background: var(--accent);
    }
    
    /* 流程 */
    .steps {
      display: flex;
      gap: 2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      max-width: 200px;
    }
    .step-circle {
      width: 50px;
      height: 50px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-weight: bold;
    }
    
    /* 案例卡片 */
    .case-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      flex: 1 1 280px;
    }
    .case-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }
    
    /* FAQ */
    .faq-item {
      border: 1px solid var(--border);
      border-radius: 10px;
      margin-bottom: 12px;
      background: white;
    }
    .faq-question {
      width: 100%;
      padding: 1rem 1.5rem;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: var(--text-primary);
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 1.5rem 1rem;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: #CBD5E1;
      padding: 3rem 0 1.5rem;
    }
    
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu { display: none; flex-direction: column; position: absolute; top: var(--header-height); left:0; width:100%; background: white; padding:1rem; }
      .nav-menu.open { display: flex; }
      .hero h1 { font-size: 2rem; }
    }